I will be trying to correct the most obvious errors that I notice. As the available reference is limited there has been room for creativity.
There is no way I can say if a steel plate is to be 0,5 mm or 1,00 mm thick.

I’m not the fastest model builder in the world, so don’t expect daily/weekly updates. I will probably also be having a lot of breaks as I without doubt will be tire and bored in periods.

This is step 18 in the instructions. The Instructions tells you to put this part at the back of the Dora, this in fact is the front part.

There are locating holes made for these parts buy unfortunately they are positioned at the middle of the model and not at the top, where it is supposed to be.

The outer shape of the parts has been remade to adapt to the shape of the sides, and according to pictures of the real thing.

I don't thing the interior is 100% correct, as I don't have any complete reference. The holes in the plates inside has been made so they resemble pictures on the step 20 parts.
There is a picture of a person standing on a latter inside step 18, so there definitely are a way through.

Bolts: Step 18 consist of 2 identical structures. These 2 structures must have been bolted together some kind of way, and this is my guess.

Welcome to PA. That's one helluva monster project you chose to start with Good luck with it and looking forward to see more of it.

Lawrence

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Adrian Cronauer [imitating Walter Cronkite]: I just want to begin by saying to Roosevelt E. Roosevelt, what it is, what it shall be, what it was. The weather out there today is hot and shitty with continued hot and shitty in the afternoon. Tomorrow a chance of continued crappy with a pissy weather front coming down from the north. Basically, it's hotter than a snake's ass in a wagon rut.

Wow, your extra detailing is amazing. I've been building mine as per the instructions.

You mentioned that the modified part is supposed to fit at the front, but the front part has a sloped part what goes into the 2 vertical slots where screws are attached. I have test fitted this monster and the part is well hidden after assembly.

There has been some rumblings in other posts that the locating holes for this particular part is incorrect, but i had no problem whatsoever with mine. Just make sure when the inside bulkheads (Parts L3 / L4) are correct, and this can be easily done by making sure the 2 holes for the screw on the main body corresponds with the vertical slots on the inside bulkheads.

I do agree that this part doesn't look right as there simply isn't enough space for a person to access the walkways in between.

As I have one of these this thread is of great interest. Hope you can keep adding updates as you go along. I wonder if with your modifications and progress shots, you could include reference images that relate to the real thing?